If any of you buy a new mat try the Alvin type self healing cutting mat. They are also used by architects. You can get it in clear or green, mine is clear. The Alvin mat is not quite as hard as others I have used. I believe I bought mine from Amazon.com, but othe places on line sell them also. I have not changed my blade since January and it is still cutting good. The are about the same price as other mats. If I ever have to buy another mat it will be an Alvin. Doris 1334